Prometheus & Blade Runner Similarities

I was just reading another blog on Ridley Scott's career, and they have a brief synopsis of BLADE RUNNER which caught my attention. There are way too many similarities between BR and the speculated plot for PROMETHEUS for me to ignore. [POSSIBLE SPOILERS!!!] Isn't BR basically a futuristic tale of humanoid cyborgs who escape their captivity, and searches for answers to their origins. Tyrell Corp who designs the Replicants (the robots) is headed by some genius tech-prophet guy not unlike Steve Jobs. The Replicants led by Rutgers Hauer defy God's law, and sneaks into Earth (it's illegal for Replicant to enter Earth from their slave colony planet, probably terraformed), and breaks into Tyrell resident which is depicted as a ginormous pyramid-like structure, and [SPOILERS] kills their Creator. Android, bio-synthesis, terraforming, pyramid, origin of life ...Need I say more, people? And it all leads to the character Deckard played by Harrison Ford. Who is he? Or rather, what is he? Android 2.0?